Question

An 80-m wide river runs in a straight line from west to east through a city.

Ann lives on the north bank of the river. Bob lives on the south bank. Every morning Ann bikes east to work,while Bob walks west to school. This morning Bob was walking at 2 m/s. What was Ann’sbiking speed when Bob and Ann were 100 m apart and the distance between them was decreasing at 6 m/s? Note: The bikeway and the walking trail run parallel to each other and are separated by the river only.

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